/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/PhysicalMaterials.h
Gets the internal list of primary materials representing the current user state of the material data
const [THandleArray](API\Runtime\Chaos\Chaos\Framework\THandleArray)< [FChaosPhysicsMaterial](API\Runtime\Chaos\Chaos\FChaosPhysicsMaterial) > & GetMasterMaterials_External() const